Process of producing sound records



. 1,491,256 A. J. CAWLEY PROCESS OF PRODUCING SOUND RECORDS Filed May 2, 1917v April 22 1924.

A TTORNE Y6 Patented Apr. 22, 1924.

STTES oFFica.

PROC$S OF PRODUCING SOUND RECORDS.

Application filed May 2,

To all whom it may concern.

Be it known that I, Anorsrus J. CAWLEY, a 1fc 'tizen of the United States, and a resident the city of Pittston, in the county of 5 Luzerne and State of Pennsylvania, have invented a new and Improved Process of Producing Sound Records, of which the following is a full, clear, and exact description. The invention relates :to the method of producing sound records on celluloid films,

as for instance moving picture films, so that talking pictures can be produced although it is not necessarily limited to this field. l5

the provision of an improved method of making records accurately, expeditiously and economically, and at the same time insure absolute synchronism between the pictures and the accompanying sounds.

In carrying out the process, thesuitable portion of the movingp-icture film is utilized for the recording of the sound. The film passes under a stylus which is in non-cutting 26 contact with it, whereby chemical action is produced so that when the film is developed, a line of metallic silver will be formed where the stylus has come in contact with the record.

record or film is obtained, which has therein a sound record groove which can be used in connection with a phonographic reproducer to recreate the original sounds.

For a more complete understanding'of the invention reference is to be had to the following description and claim taken in connection with the accompanying drawings, which illustrate certain embodiments of the 40 invention and wherein similar reference characters are employed to designate corresponding parts.

' to this purpose.

The inventionhas for its generalob-jects' This film is developed, and a reproducing 1917. Serial No. 165,861.

Figure 1 is an interior view of a moving picture camera showing the sound recording means in connection with the film thereof.

Figure 2 is a detail view of the sound recordcr on the camera.

The film A, as it passes through a motion picture camera B, is in contact with a stylus, or recording point 1 of a sound recorder C, preferably of the lateral cut type, as this type of sound recording is specially adapted Although the film may not be abrased or marked in any manner, still when it is developed, it will be found that the silver haloid of the film has been reduced to metallic, silver wherever the stylus has come in contact with the film. A dark line of metallic silver will thus be produced.

The sounds are to be received at the camera, the stylus being attached directly to a diaphragm on WlllCl'l the sounds impinge.

If the metallic silver sound record oba tained as described above is found to be too faint, it can be intensified in any ordinary manner, such as by means of mercuric chloride.

It is desirable that the film in the camera be driven b a constant speed motor in order to obtain the proper recording of sounds Having thus described my invention, I claim as new and desire to secure by Letters Patent,

In the herein described process of making sound records, consisting in vibrating a stylus in uncutting contact with a photo'- sensitive medium to chemically alter the same along the line of contact and developso ing the said medium.

Pittston, Pa, July 7th, 1922.

ALOYSIUS J./QAWLEY. 

